Friction collar for sewing machine spool-pins



Oct. 31, 1933. D. H. cHAsoN v FRICTION COLLAR FOR SEWING MACHINE SPOOL PINS Filed March 19, 1931 Wm: I

Patented Oct. 31, 1933 I UNITED STATES AT NT OFFICE 3 FRICTION coLLAn FOR. SEWING MA HINE,

I SPOOL-PINS I Daniel H. Ohason, Elizabeth, N. -J., 'as'signor to The Singer Manufacturing Company, Elizabeth, N. 3., a corporation of New Jersey Application March 19, 1931. Serial No. 523,729

' 8 Claims. (Cl. 242134) This invention relates. to friction collars applicable to sewing machine spool-pins to retain the thread-spool upon the spool-pin, either with or without tensioning the thread-spool. The invention has for an object to. provide a threadspool retaining collar which is inexpensive to manufacture and which is readily applied to and removed from the sewing machine spool-pin. A further object of the invention is to provide a device of the class described which may be stamped from a single blank of sheet metal and requires no soldering, riveting or other joining operations.

The invention comprises the devices, combinations and arrangements of parts hereinafter described and claimed.

The features of the invention and the advantages attained thereby will be readily understood by those skilled in the art from the following detailed description of one specific embodiment of the invention which I have chosen for the purpose of the present disclosure.

In the accompanying drawing, Fig. 1 is a fragmentary side elevation of a sewing machine bracket arm and spool-pin carrying a friction collar embodying the invention. Fig. 2 is a top plan View of the device. Fig. 3 is a bottom plan view, and Fig. 4 is a sectional view on the line 4--4, Fig. 2.

The device illustrated comprises a sheet metal ring or band 1 of cylindrical form having at its lower end an annular head-wall 2 from the inner edge 3 of which project radially inwardly the arms 4 originally of triangular shape. The spaces between the arms 4 are also preferably triangular shaped and are preferably equal in size, number and shape to the arms 4 themselves, as shown in Fig. 2.

The inner ends of the arms 4 are bent flatwise of the arms themselves, so that they all extend in the same direction normal to the plane of the bases of such arms, as shown in Fig. 4, and define a circular aperture slightly smaller in size than the spool-pin with which the device is to be used. When in place upon the spool-pin, the inner sides of the inner end-portions of the arms 4 which extend lengthwise of and parallel to the spool-pin, grip the spool-pin over a lengthwise extended surface-portion of the latter and thus prevent accidental tilting of the ring out of its normal position which is square with the spoolpin. If the arms 4 touched or pressed upon the spool-pin only at their points or extreme ends 5, the ring would be unsteady on the spool-pin and easily tilted and deformed during removal or -replacement', Furthermore, the friction grip would be impaired. The extended surface grip, herein provided, as distinguished from a point grip, is thus of material advantage and will stand considerable wear without becoming loose on the pin. The ring or band 1 is formed at its upper end with a peripheral flange 6 the free edge of which is reduced in diameter and overhangs the tip-ends 5 of the arms 4, guarding the latter against injury. The arms 4 are sufficiently resilient to frictionally grip the sewing machine spool-pin 7, when applied to the latter, and prevent displacement of the thread-spool 8 therefrom under various conditions, as when the sewing machine is turned on its side for inspection of the mechanism below the sewing machine cloth-plate, or when the machine, is dropped into the cavity of the usual drop-head cabinet; The device also prevents climbing of the spool upon the spool-pin during bobbin-winding operations.

The device may be used to apply a frictional drag or tension to the spool, if desired, by pressing it into engagement with the upper end of the spool, such spool preferably resting upon the usual felt washer 9.

The device is as easily removed from the spoolpin as it is applied, there being no excessive grip or toggle-action of the arms 4 upon the spoolpin in either direction of motion of the device on the spool-pin.

Having thus set forth the nature of the invention, what I claim herein is:-

1. A friction collar for sewing machine spoolpins comprising, a sheet metal ring having a plurality of spaced, resilient, inwardly extending, radial arms lying in a common plane, the inner free endsof said arms having extensions normal to the plane of the bases of said arms, said ring having a peripheral flange on the same side of said planeas the free ends of said arms to guard the latter.

2. A friction collar for sewing machine spoolpins comprising, a sheet metal ring having a plu-' rality of spaced, resilient, inwardly extending, radial arms'the outer ends of which lie in a common plane, the inner free ends of said arms extending in a direction normal to the plane of the bases of said arms, said ring having a peripheral flange overhanging the free ends of said arms. V

3. A friction collar for sewing machine spoolpins comprising, a sheet metal ring having a plurality of spaced, resilient, inwardly extending, radial arms the outer ends of which lie in a common plane, the inner free ends of said arms extending in a direction normal to the plane of the bases of said arms, said ring having a peripheral flange the free edge of which is reduced in diameter to guard the free ends of said arms.

4. A friction collar comprising a sheet metal ring having a plurality of spaced, inwardly extending, triangular-shaped resilient arms the bases of which lie in a common plane, the spices of said arms being bent in the same direction to stand at an angle to said plane and define an axial aperture, said ring having a peripheral flange the free edge of which is reduced in diameter to guard the free ends of said arms.

5. A sewing machine spool-pin stop comprising a cylindrical sheet-metal band having at one end a plurality of spaced flat triangular-shaped resilient arms having gaps between their bases and extending radially toward the axis of said band in a common plane, said arms being bent fiatwise between their ends to direct their free ends parallel to the axis of said band.

6. A sewing machine spool-pin stop comprising a cylindrical sheet-metal band having at one end a plurality of spaced flat triangular-shaped resilient arms extending radially toward the axis of said band, said arms being bent flatwise between their ends to direct their free ends toward the other end of said band, the free ends of said arms terminating within said other end of said band.

'7. A friction collar for sewing machine spoolpins, comprising, a sheet metal ring having a plurality of spaced, resilient arms having inwardly extending radial portions lying in a common plane, said arms having inner free terminal extensions normal to such plane.

8. A friction collar comprising a sheet metal ring having a plurality of spaced triangularshaped resilient arms having inwardly extending portions lying in a common plane with gaps between their bases, the apices of said arms being bent in the same direction to stand substantially normal to said plane and define an axial aperture.

DANIEL I-I. CHASON. 

